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ILC DBD Common simulation and software tools

ILC DBD Common simulation and software tools . Akiya Miyamoto KEK ILC PAC 14 December 2012 at KEK. Introduction. Software tools for ILC have been developed by ILD and SiD independently but with good communication For DBD studies,

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ILC DBD Common simulation and software tools

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  1. ILC DBDCommon simulation and software tools Akiya Miyamoto KEK ILC PAC 14 December 2012 at KEK

  2. Introduction • Software tools for ILC have been developed by ILD and SiD independentlybut with good communication • For DBD studies, • IDAG has requested us to study benchmark processes based on common generator samples  Common generator samples • Some software tools Common work are desirable for saving resources and better tools Common software tools DBD : Common Software Tools

  3. Common generator samples • LOI era: by Whizard 1.40, generated at SLAC, shared by 4 concept groups through FTP • Improvements for DBD • Whizard 1.95 with new features such as • full CKM matrix, complete t polarization treatment, stores more information in generated files. • Physsim for tth & 8 f background processes • Sample generations at SLAC, DESY, KEK and common files are placed on ILC VO GRID. • Common format for generator meta info. ( process ID, names, cross sections, file names, …) and kept on webs. • Beam-beam effects : based on sets of TDR parameters1TeV_B1b_ws , 500GeV_TDR_ws (nominal Lumi.) DBD : Common Software Tools

  4. Whizard 1.95 generator • Tree calculation of 2n processes with multiple ISR g’s. Hadronization and decay of final n particles by Pythia. Tauola for t. • All (e+e-, e+g, ge-,gg)  n processes ( n=2~6 particles ) and e+e-  h:Luminosity spectrum by GuineaPigg : nearly real Weizsacker-Williams photons (Whizard) orbeamstrahlung photons(GuineaPig). • ISR: Whizard default ( order 3 LLA., include Pt of remnants) • FSR by Pythia : QED for m and t, QCD&QED for quarks. No QED FSR of e ( Can not give correct q2 to Pythia.) • Higgs : h processmH=125GeV. h decays by Pythia with BRs given by a LHC WG. Other processes mH=2TeV • Amplitude with a gluon propagator in Whizard : OFF.  Pythia simulate gluon splitting.  No interferences between QCD and EW amplitude. 10% effect DBD : Common Software Tools

  5. Physsim generator for It was hard to generate processes with 8 fermions or more by Whizard, because too many CPU time and memory requirements due to many channels involved. Physsim calculates only a limited number of diagrams. Saves CPU time. Used for generating , and in and hadronize independently w. e+(e-) luminosity spectrum, ISR, hadronization/decay : same as Whizard samples. DBD : Common Software Tools

  6. Hadronization tuning LEP data indicates less neutral hadrons than Pythia default • Hadronization parameters for the LOI : Pythia default.LEP data suggest Pythia default parameters over-estimates neutral and long-lived hadrons • direct impact on jet energy resolution, because neutral hadron energy is the component measured with least precision. • Parameters for DBD DBD : Common Software Tools

  7. Summary of generated samples Whizard e±polarizarion=±100% g source: Weizsacker Williams/ Beam-strahlung Pythia in Whizard (gpoint) Peskin&Pythia ( gluon in g) GuineaPig (for Overlay) Whizard (Mh=125 GeV) Physsim • Samples are grouped by “aliasing” and “process grouping”: 1675 proc./~20k files • mq=0, mjj>10GeV • No Lorentz boost for crossing angle. No smearing of IP position DBD : Common Software Tools

  8. Common Sim./Rec. tools : LCIO • Both ILD and SiD have developed their software tools based on LCIO. • LCIO provides • Common event data model. • Common file format • Development has started since 2003. • New developments since LOI • LCIO : 1.x  2.x • Random access to records(crucial for BKG overlay) • Extends Track class to hold • Multiple track states at IP, at First/LastHits, at Calorimeter • 1D Tracker hits for correct treatment of Si-Strip detectors • Support ROOT • etc. DBD : Common Software Tools

  9. Common Tools : PFA and LCFIPlus • Particle Flow Algorithm (PFA) • A key package for excellent jet measurements. PandoraPFA was successfully used for LOI study in ILD framework • For DBD • Re-coded as a standalone library with essentially no external dependencies.  adaptation to each concept is easy. • Improved performance • LCFIPlus • Heavy quark tagging is crucial for ILC physics • In LOI, LCFIVertex: Originally developed for SLD Z physics ( optimized for 2-jet events. Flavour tagging after jet clustering) • For DBD, LCFIPlus • Aimed for multi-jet environments : Vertexing Jet Clustering  Tagging • TMVA based flavor tagging : allows analysis dep. tagging condition DBD : Common Software Tools

  10. Summary Event samples and software tools for DBD have been prepared with common efforts between SiD and ILD New issues appearsduring DBD exercise Common software group has started to discuss issues post DBD era. DBD : Common Software Tools

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